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But it is discussing how to use them, the officials say, with a mix of overt military pressure, covert action, and steps to punish any Chinese banks that do business with North Korea, by banning them from also doing business with the United States.

Hurricane Irma on Monday weakened to a Category 1 storm with top sustained winds of 120km/h battering Florida with continued hurricane-force winds, torrential rain and risky storm surges, leaving almost six million without power.